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Lewis, Cathleen S. "Sputnik." World Book Student. World Book, 2010. Web. 9 June 2010.
Smith, Roger. "United States Launches Its First Orbiting Satellite." The 20th Century. Salem Press, Web. http://history.salempress.com.
Tobias, Russell R. "First Humans Land on the Moon." The 20th Century. Salem Press, Web. http://history.salempress.com.
Urbanowicz, Charles F. "Soviet Union Launches the First Artificial Satellite." The 20th Century. Pasadena: Salem Press, Web. http://history.salempress.com.
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